Revert

plugins/mongodb_datasource/datasource.py

         collection_name = object_collection_name(target)
         collection = self.database[collection_name]
 
-        if not target.abstract:
-            # Add the class name to the filters
-            filters.append(('classname', '=', target.__name__))
-
         query_filters = self.__process_filters(
             target, filters, rel_filters)
         query_result_ordering = None

plugins/mongodb_datasource/utils.py

 # @param class_object EmClass
 # @return str
 def object_collection_name(class_object):
-    if class_object.abstract:
-        return class_object.__name__
-    else:
-        return object_collection_name(class_object.__base__)
-
+    return class_object.__name__
 
 ## @brief Determine a collection field name given a lodel2 fieldname
 # @note For the moment this method only return the argument but EVERYWHERE